This is not the actual use case, but for the sake of simplicity we assume I have an ActiveRecord animal model in a Rails app. The animals have one name (string) and rating (Int). There could be animals with the same name but different ratings. In my animal model, I have a hard-coded constant like this:

I would like to retrieve a single ActiveRecord: relation with all animals that meet these attributes exactly, I can not pass an array to that where Clause like where(name: ('Cat', 'Dog', etc), rating: (3, 5, 1)) because I only want cats with rating 3 and dogs with rating 5 and so on. As I said earlier, there may be multiple records with the same name but different ratings.

In the animal model, I have a class method (basically an area) to capture the records that match the types specified in SPECIAL_ANIMAL_TYPES. The following code does what I want, but is clearly pretty ugly. If I add more types to SPECIAL_ANIMAL_TYPES, I would have to change this method:

But that returns an array and I want an ActiveRecord relation. Is there a more elegant way to write this class method so that I can continue to add types to the constant and use that method dynamically?

I would like to know what these terms mean, but unfortunately I have not found any material that makes things "baffled". Please note that I know what the academic Definitions for these things are. I still have no idea what they are or how they are tied to web applications.

Today I came across the following:

"The main drawback of using the classic style instead of the
Modular style is that you only have one Sinatra application pro
Ruby process. "

By a dumb person, when I copy my code to my server and execute the appropriate commands to start the application – in this case, one of **ruby app.rb**. **rackup -s thin**. puma -C /path/to/config_fileetc. – I assume that only one Sinatra application is running. The cited statement implies that it is possible to have more than one ruby ​​process.

Can someone please explain to me what a Ruby process is? It would be very grateful if the explanation could be linked to the way cmds wish it **RAILS_ENV=production rails s** or **ruby app.rb** Perform more than 1 ruby ​​process.

This problem comes from part of a LeetCode solution for rotated arrays.

Suppose an array sorted in ascending order is rotated by a specific pivot point
previously unknown.

(ie. (2, 3, 5, 6, 7, 8, 12) could be (6, 7, 8, 12, 2, 3, 5)).

(And we just want to find here the "rotation point" which is 4 because nums(4) is 2 in the array, which we call "rotation point" here)

You can assume that there is no duplicate in the array.

The runtime complexity of your algorithm must be in the order of: $$ O ( log n) $$

I've just used the standard binary search technique, but for some reason I'm not so confident that the following can deliver the right result all the time. For example, the following code version 2 actually contains at least one error, which, however, is not obvious.

Can the code be changed to make it safer to use the standard binary search?

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I tried to see the difference between a library and a framework. And from one of the posts it became clear that the biggest difference is the reversal of control, d. H., where framework calls your code.

Martin Fowler's article on IoC seems to be pretty good, unless it's in ruby ​​language that I do not know. What exactly does the following code do?

My understanding If the code flow is event-driven, or generally whenever .NET functions such as anonymous types, extension methods, lambda expressions, etc. are used, the inversion of the controller can be detected

The program seems to be with me at all. I took out the char.name part and just executed a blank block and got the same result as above, minus the Joe Jane bit. I reset my server, deleted it from the database and reloaded it, and compared it with similar code I used in other projects that do not get these weird results. I am not sure what causes this curiosity.